Introduction to Exchange 2003 and IIS
(Internet Information Services)
Improvements in IIS are one of the major difference between Windows 2000 and
Windows Server 2003. Whilst you could predict that Exchange will need IIS to render OWA (Outlook
Web Access), it is less obvious that IIS supplies other essential services, for
example, OMA (Mobile Access) the queuing engine, authentication and ISAPI filters. Also, see
how Worker Processes make IIS much more stable than the Windows 2000 version.
Topics for Exchange and IIS
Owing to Microsoft's new 'Security by default' initiative, you need to
configure IIS in Windows Server 2003 for Exchange 2003 to work. By default
IIS is no longer installed. So you need to added the SMTP, NNTP and
ASP.NET services via the ADD or Remove Programs / Windows Components
/Application Server, next create a snap-in to Web Service Extensions, finally
configure the IIS to allow dynamic content.
 If you ever need to restart IIS, try iisreset at the command prompt (not iisrestart)
There have been major
changes between Windows 2000 and Server 2003. One clue that these are
momentous changes are the version numbers. Where as most of the other
Windows Services change from version 5.0 to 5.1, IIS changes from version 5.0 in Windows
2000 to version 6.0 in Windows Server 2003.
Divide
and rule is the philosophy which makes IIS 6.0 so much more stable than v 5.0.
The big change is that the WWW Service and Administration is now a separate
process from Web Applications. In practical terms you can create Worker
Processes and assign applications to each process. These pools of
applications can be kept separate so making a more stable and controllable Web
Server.
IIS 5.0 on the other hand has only 'isolation mode' which is not compatible with
Exchange 2003. (See here for
more on compatibility)
Exchange 2003 needs 'Worker process isolation mode'.
W3WP.exe is the program that is responsible for Worker Processes, and it
replaces DLL.Host in Windows 2000.
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HTTP.SYS is well named as its job is to route HTTP requests to
OWA. Think of HTTP.SYS as a good listener that manages TCP/IP connections
and sends requests
to the correct queue.
It works by fetching stored procedures, however, there are no worries that user
mode code can execute directly in the kernel. In addition Kernel mode caching results
in a 70% improvement in dealing with http get requests.
INETINFO.EXE is still there running the components such as: SMTP, NNTP,
ADO and ODBC connections.
The Metabase - that strange registry for IIS, has been replaced with Metabase.xml in the %windir%\system32\inetsrv folder.
N.B. the default %windir% would be Windows rather than WINNT.
BITS (Background Intelligent Transfer Service) is a little know add to manage
downloads intelligently, what it does is conserver downloads when bandwidth is
in short supply. To install navigate to Add or Remove Programs, Windows
Components, Application Server, IIS, BITS. Its worth checking out the IIS
options even if you do not wish to install BITS just yet.
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Windows Server 2003 introduces big changes with version 6.0 of IIS. There
are two reasons for investigating what's new, firstly, to understand what use
Exchange 2003 makes of IIS, and secondly, to understand why web applications are
more stable and controllable with IIS v6.0.
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Lots of tips, recommendations and troubleshooting advice. Problem
solving section. Active Directory explained. Printer friendly
pages.
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